Michael Jackson’s sister Janet Jackson is being accused of shamefully swiping a massive memorial to the King of Pop erected outside his childhood home in Gary, Ind.

The Moonwalker’s kid sister is under a dark cloud after the eight-foot tall monument featuring Michael dancing disappeared — in the middle of the night — “around the time Janet was in Gary,” an insider said.

“It’s more than a little suspicious. She would have had plenty of time to sneak in overnight and have a professional service truck move it to a storage facility. No one would put it past her.”

her third hubby and dad of her only child, year-old son Eissa.

“To say she’s paranoid would be an understatement,” said the source. “She fears her ex is spying on her. She’s anxious all the time. She doesn’t go out in public without her bodyguard.”

The beauty is also on the outs with relatives for taking over the care of her dying 87-year-old mom Katherine, the family matriarch who controls Michael’s $2 billion fortune.

Until Janet whisked her away, Katherine was supposed to be watching the Thriller legend’s kids — Prince, 21, Paris, 19 and Blanket, 16.

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“She got into a huge fight with Paris and Prince, who accused her of keeping them from their grandma,” said the source.

“Katherine is elderly and doesn’t know what’s going on half the time. There are some in the family who believe Janet is taking advantage of Katherine in order to control her bank accounts and credit cards.”

Meanwhile, “a lot of people in Gary are complaining that Janet was the mastermind behind the monument’s disappearance,” said the insider.

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